GNSS-based real-time high-precision wave measurement method and device

Abstract

The invention provides a novel real-time high-precision wave measurement method based on GNSS. GNSS phase, pseudo-range, Doppler frequency shift observation values and broadcast ephemeris are collected through a GNSS receiver (or board card) and an antenna carried by sea surface carriers such as a wave buoy, the three-dimensional speed of the carriers such as the buoy is obtained through epoch difference of the phase observation values, and then element information such as the direction spectrum, the frequency spectrum, the wave height, the period and the wave direction of waves is obtained; the change of displacement along with time is obtained by integrating the speed for a certain time length and removing a linear trend term, and wave element information can be also obtained through solving; and no extra precise differential correction number is needed, so that the service cost and the communication cost of precise differential correction are saved. The method is suitable for offshore and pelagic scenes, high-precision wave element information is obtained in real time and stored in the buoy locally or periodically for communication and return, the working range of GNSS-based ocean wave measurement is expanded, and the method has high practical application value.

Description

technical field [0001] This patent belongs to the field of marine environment monitoring, and is applicable to all water environment scenarios such as lakes, rivers, and oceans, and is especially applicable to a GNSS-based real-time high-precision wave measurement method in the open sea. Background technique [0002] As an important movement phenomenon in the ocean, waves are of great significance to monitor the changes of waves and study their laws, which are of great significance to human activities in the sea and disaster reduction and prevention activities. In recent decades, with the continuous increase of human development activities on the ocean, the research on ocean observation methods and the development of instruments and equipment have been greatly promoted. At present, various wave measuring instruments have appeared: acceleration wave measuring instrument, pressure wave measuring instrument, acoustic wave measuring instrument and GNSS wave measuring buoy, etc. ...

AI Technical Summary

Problems solved by technology

[0004] (1) To achieve real-time centimeter-level measurement accuracy, a large amount of communication bandwidth is required to transmit the GNSS observations of wave buoys back to the data processing center for real-time calculation, resulting in communication costs, especially the communication costs of remote sea satellites. And because the communication reduces the real-time performance; if the GNSS observation value of the wave buoy is calculated in real time locally on the buoy, an additional differential correction service is required. Among them, the differential correction service needs to be obtained by communicating with the land in the offshore, and it needs to be obtained from the communication satellite in the open sea. Obtain differential correction services, thus increasing the cost of purchasing differential correction services and communications

[0005] (2) To achieve centimeter-level measurement accuracy after the event, a large amount of communication bandwidth is required to transmit the GNSS observation data of the wave buoy back to the data processing center for subsequent calculation, resulting in communication costs, especially the communication costs of remote sea satellites; If the wave buoy is recovered and then read GNSS data for calculation, on the one hand, the cost of recovery operation is increased, and the automation is poor; on the other hand, the cost of storing a large amount of GNSS data in the wave buoy is also increased

[0006] From the above analysis, it is not difficult to understand that the current traditional GNSS wave measurement method has great disadvantages and limitations in real-time high-precision wave measurement

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